How can I handle errors in RxJava?

How can I handle errors in RxJava?

In RxJava, you can handle errors using operators like onErrorReturn, onErrorResumeNext, and retry. Would you like examples of these?

Yes, please provide an example of using onErrorReturn.

Sure! Here's a simple example:

Observable<Integer> observable = Observable.create(emitter -> {
    emitter.onNext(1);
    emitter.onNext(2);
    emitter.onError(new RuntimeException("Error occurred!"));
});

observable
    .onErrorReturn(throwable -> -1)
    .subscribe(System.out::println);

This will print 1, 2, and then -1 when an error occurs.

What about onErrorResumeNext?

onErrorResumeNext allows you to switch to another Observable when an error occurs. Here's an example:

Observable<Integer> observable = Observable.create(emitter -> {
    emitter.onNext(1);
    emitter.onNext(2);
    emitter.onError(new RuntimeException("Error occurred!"));
});

Observable<Integer> fallback = Observable.just(3, 4);

observable
    .onErrorResumeNext(fallback)
    .subscribe(System.out::println);

This will print 1, 2, and then 3, 4 from the fallback.